It appears to me, from the info on MeLands that this Gisulf is the great-grandson of Queen Menia by an unnamed child of her son Audoin.
http://fmg.ac/Projects/MedLands/HUNGARY.htm#GisulfFriulia
in this Gisulf's About section comes from the section of Gisulf who was one of two children of Audoin, who was a son of Queen Menia.
This is Menia, Audoin's mother and great-grandmother of this Gisulf (if he hasn't been confused with another Gisulf, since there are several):
These are duplicate profiles for Menia's son Audoin:
The child of Audoin who was the father of the Gisulf whose info is in the About section of this profile isn't name, appears to be unknown.